Produção e caracterização de filmes compostos de mucilagem da semente da linhaça marrom e poli (álcool vinílico)

Abstract

Materials used in packing production, from the synthetic origin, has aroused concerns because environmental problems generated in its final discard by low biodegradability. Alternative materials, that besides being biodegradable unite the concept of agro-industrial waste recycling, that have been winning space in partial or full replacement of traditional polymers. Having these concepts, this work produced films made of poly (vinyl alcohol) (PVA), it is a synthetic polymer usually used in factories and mucilage extracted from Flaxseed, which are considered an industrial ink residue and that have not been used for this purpose. The blends were obtained by film casting methodology. The blends are produced with varying the ratio mucilage and PVA, keeping the concentration of plasticizer glycerol constant. The films were characterized as: media thickness, mechanic properties (Young’s module, maximum resistance to traction, elongation at break, maximum strength in drilling and deformation in drilling), water vapor permeability and humidity. Besides that, the microstructure of the materials was studied by electron microscopy scanning (SEM) and thermal characteristics were made by differential scanning calorimetry (DSC). The blends show similar color with flax seed besides the easy malleability. The DSC analyses showed a plasticizer effect of mucilage blends, with a significant reduction at Tg and Tm blends. The flax seed mucilage provided low resistant hard films, but are more flexible and don’t have significant changes of the barrier properties to water vapor than of pure mucilage films. SEM images revealed, in general, the mucilage and PVA form a compact and homogeneous structure helping with the DSC results, which indicated a modification of Tg and reduction in Tm ratio.